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Section VIII-I Appendix 1-7(b)
2

Section VIII-I Appendix 1-7(b)

Section VIII-I Appendix 1-7(b)

(OP)
I am designing a large opening in a large vessel.  The design requires App. 1-7(b) calculations.  The opening passes reinforcement calculations easily.  It is failing 1-7(b) though.  The use of a pad is not available but gussets can be used.  Dos anyone know how to take advantage of the added stiffness that the gussets will provide when looking at 1-7(b)?  If not, does anyone know of an accepted method to be used in lieu of 1-7(b)?

RE: Section VIII-I Appendix 1-7(b)

You can't take advantage of the gussets but you can for a flange per Fig 1-7-2, if you have one. Why can't you add a pad?

RE: Section VIII-I Appendix 1-7(b)

(OP)
Their are several issues but what it really comes down to is it is not a point of flexibility with the customer.  But never the less, the calculation has to be met somehow.  Thanks for your reply.

RE: Section VIII-I Appendix 1-7(b)

If your customer doesn't like pads you can use an insert plate in the shell (locally thickened portion). This is very common to satisfy integral reinforcement.

RE: Section VIII-I Appendix 1-7(b)

Or try increasing the thickness of the neck. This will give you the most bang for the buck since it will increase the moment of inertia more readily.

RE: Section VIII-I Appendix 1-7(b)

(OP)
Thank you both for your suggestions.  I will incorporate this.

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